DIELECTRIC-RELAXATION AND A NEW PHASE OF CYCLOOCTANOL AT PRESSURES TO 1-GPA

Of the four previously known solid phases of cyclooctanol (I, II, IV and V in our notation), two (IV and V) are stable only at high pressure. In this work, new data on dynamic dielectric properties of cyclooctanol at high pressure are presented. The results are compared with corresponding thermal conductivity data. It is concluded that the dielectric properties of phase II are consistent with the thermal conductivity properties if it is assumed that a substantial fraction of the dipoles interact with each other. The molecular interaction favours reorientation around an axis of negligible dipole moment. The new solid phase, phase III, which was discovered through thermal conductivity measurements, is detected dielectrically in the present study.